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Self-healing Ability of Conductive Polypyrrole Coating with Artificial Defect

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Title: Self-healing Ability of Conductive Polypyrrole Coating with Artificial Defect
Authors: Kowalski, Damian Browse this author
Ueda, Mikito Browse this author
Ohtsuka, Toshiaki Browse this author →KAKEN DB
Issue Date: 2009
Publisher: The Electrochemical Society
Journal Title: ECS Transactions
Volume: 16
Issue: 52
Start Page: 177
End Page: 181
Publisher DOI: 10.1149/1.3229965
Abstract: A bi-layered PPy film consisting of an inner layer doped with Keggin-structure anions of PMo12O40 3- and HPO4 2- (PPy-PMo12) and an outer layer doped with organic anions of dodecyl sulfate (PPy-DoS) exhibited a self-healing property when coated on steel. When a defect was introduced into the PPy-coated steel immersed in 3.5% NaCl aqueous solution, the potential initially decreased and activation of the coated steel occurred. After a few hours, the potential was recovered to the passive region, and the passivation continued for another 20 hours. Without any damage, the release of PMo12 doped in the inner layer was inhibited by the outer PPy layer doped with DoS. When a defect was introduced into the PPy film, the inner PPy layer released phosphate and molybdate anions to the damaged zone due to their decomposition via hydrolysis. Both anions work as passivation inhibitors and helped to repassivate the damaged zone on the steel.
Rights: © The Electrochemical Society, Inc. 2009. All rights reserved. Except as provided under U.S. copyright law, this work may not be reproduced, resold, distributed, or modified without the express permission of The Electrochemical Society (ECS). The archival version of this work was published in ECS Transactions, Volume 16, Issue 52, pp. 177-181, 2009.
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 大塚 俊明

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